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| | number = ML13354B755 | | | number = ML13354B755 |
| | issue date = 02/04/2014 | | | issue date = 02/04/2014 |
| | title = Edwin I. Hatch Nuclear Plant, Unit Nos 1 and 2, Exemption from the Requirements of 10 CFR Part 50, Section 50.46, and Appendix K (TAC Nos. MF1479 and MF1480) | | | title = Exemption from the Requirements of 10 CFR Part 50, Section 50.46, and Appendix K (TAC Nos. MF1479 and MF1480) |
| | author name = Martin R E | | | author name = Martin R E |
| | author affiliation = NRC/NRR/DORL/LPLII-1 | | | author affiliation = NRC/NRR/DORL/LPLII-1 |
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Category:Exemption from NRC Requirements
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[Table view] Category:Letter
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[Table view] |
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UNITED NUCLEAR REGULATORY WASHINGTON, D.C. 20555*0001 February 4, 2014 Mr. C. R. Pierce Regulatory Affairs Director Southern Nuclear Operating Company, Inc. Post Office Box 1295, Bin -038 Birmingham, AL 35201-1295 EDWIN I. HATCH NUCLEAR PLANT, UNIT NOS 1 AND 2, EXEMPTION FROM THE REQUIREMENTS OF 10 CFR PART 50, SECTION 50.46, AND APPENDIX K (TAC NOS. MF1479 AND MF1480)
Dear Mr. Pierce:
The U.S. Nuclear Regulatory Commission (NRC) has approved the enclosed exemption from specific requirements of Title 10 of the Gode of Federal Regulations (10 CFR), Part 50, Section 50.46, "Acceptance criteria for emergency core cooling systems [ECCS] for light-water nuclear power reactors," and Appendix K, "ECCS Evaluation Models," for the Edwin I. Hatch Nuclear Plant, Units 1 and 2 (HNP). This action is in response to Southern Nuclear Company's (SNC's, the licensee) letter dated April 23, 2013 (ADAMS ML 13115A480).
SNC's letter of April 23, 2013, constitutes the licensee's second request for an exemption from the above fuel cladding material requirements in order to irradiate two GE14 Lead Test Assemblies (L TAs) in the HNP. The L TAs include a limited number of fuel rods manufactured with an advanced cladding alloy, known as Global Nuclear Fuel (GNF) Ziron, which is outside of the cladding materials specified in the regulations (Le. zircaloy or ZIRLOTM).
By letter dated November 7, 2008, the NRC approved an earlier SNC request for an exemption in order to irradiate these two GE14 L TAs in the HNP Unit 2 reactor for cycles 21, 22 and 23 (ADAMS ML082950149).
These two LTAs have now completed operation in cycles 21 and 22; however, SNC decided not to include them in the Unit 2 cycle 23 core loading in order to allow sufficient time to perform pool-side inspections.
Since the original exemption request applied only to the operation of the L TAs in the Unit 2 reactor for cycles 21-23, SNC has requested a second exemption in order to continue irradiation of the L TAs in either of the HNP reactors for one or more additional cycles, up to GNF's approved peak pellet exposure.
As stated in the enclosed safety evaluation, the NRC staff concludes that application of 10 CFR 50.46 and Appendix K to 10 CFR 50 for this revised schedule is not necessary to achieve the underlying purposes of the rule and that it is acceptable to grant an exemption from the requirements of 10 CFR 50.46 and Appendix K to 10 CFR Part 50 for the use of two L TAs in either of the HNP reactors for one or more additional cycles, up to GNF's approved peak pellet exposure.
In addition to SNC's request for an exemption from certain parts of 10 CFR 50.46 and Appendix K,Section IV of SNC's letter dated April 23, 2013, addressed how other regulatory requirements related to the use of the L TAs are to be met by SNC. Specifically, the letter indicated that loading and irradiation of the L T As will also be evaluated by SNC as a change to the plant as required by 10 CFR 50.59, "Changes, tests and experiments." This approach is consistent with the HNP Technical Specifications which allow a limited number of L TAs, provided they are
( ( ( ( C. Pierce -2 placed within non-limiting locations.
As such, the NRC staff review in the enclosure addresses the exemption request pursuant to 10 CFR 50.12, and does not address core physics, core thermal hydraulics, fuel thermal-mechanical design, or Updated Final Safety Analysis Report (USFAR) safety analyses aspects of the LTAs nor their placement in non-limiting core locations.
Additionally,Section V of GNF's technical basis document (Enclosure 2 of ML 13115A480) notes that the GNF fuel rod thermal mechanical code PRIME03 is now being used to assess fuel rod performance.
The PRIME03 code (ADAMS ML 102600248), which accounts for dependent fuel thermal conductivity, replaces the legacy GESTRM fuel rod performance code. While not explicitly approved for GNF-Ziron, the use of PRIME03 is consistent with the approved GNF reload methodology and therefore acceptable.
A copy of the enclosed exemption has been forwarded to the Office of the Federal Register for publication.
Sincerely, Manager Plant licensing Branch 11-1 Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366
Enclosure:
Exemption cc w/enclosure:
Distribution via Listserv C. Pierce placed within non-limiting locations.
As such, the NRC staff review in the enclosure addresses the exemption request pursuant to 10 CFR 50.12, and does not address core physics, core thermal hydraulics, fuel thermal-mechanical design, or Updated Final Safety Analysis Report (USFAR) safety analyses aspects of the LTAs nor their placement in non-limiting core locations.
Additionally,Section V of GNF's technical basis document (EnClosure 2 of ML 13115A480) notes that the GNF fuel rod thermal mechanical code PRIME03 is now being used to assess fuel rod performance.
The PRIME03 code (ADAMS ML 102600248), which accounts for dependent fuel thermal conductivity, replaces the legacy GESTRM fuel rod performance code. While not explicitly approved for GNF-Ziron, the use of PRIME03 is consistent with the approved GNF reload methodology and therefore acceptable.
A copy of the enclosed exemption has been forwarded to the Office of the Federal Register for publication.
Sincerely, IRA! Robert E. Martin, Senior Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366
Enclosure:
Exemption cc w/enclosure:
Distribution via Listserv DISTRIBUTION:
PUBLIC ADAMS Accession No'.. ML 13354B755 OFFICE NRR/LPL2-/PM NRR/LPL2-1/LA NRRlSPNB/BC OGC NRR/LPL2-1/BC NRR/DORLID NAME RMartin SFigueroa SWhaley CKanatas RPascarelli MEvans DATE 01/9/14 12/23/13 07/17/13 01/09/14 1131114 2/4114 OFFICIAL RECORD